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A kind of PDC drill bit with high efficiency and heat radiation tooth
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A kind of preventing sticking PDC drill bit
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A kind of heteromorphic teeth PDC drill bit
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A kind of novel combined drill bit
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A kind of PDC drill bit with roller type rule footpath
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A kind of PDC drill bit with fabricated structure
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A kind of PDC drill bit hydrophthalmia Anti-blocking structure
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A kind of PDC drill bit of the anti-mud drum nozzle arrangements of band
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A kind of PDC drill bit carcass preparation technology
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Anti-whirling reverse rear perforation tooth drill bit
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Diversified PDC (polycrystalline diamond compact) drill bit with whole rear row teeth detachable
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A kind of PDC drill bit carcass powder compositing formula and preparation technology
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